Refactoring Katas - AgileBrazil 2011

Refactoring Katas Danilo Sato - @dtsato ThoughtWorks www.dtsato.com

Kata?• Exercícios para praticar• Melhorar habilidades especíﬁcas: • TDD • Algoritmos • Design • Código Ruim? • ...

Kata?TestTestTestTest

RefatoraçãoTest

RefatoraçãoTest Code

Refatoração CodeTest

Refatoração CodeTest Remover duplicação

Outros tipos... CodeTest

Outros tipos... Code CodeTest

Outros tipos... Code CodeTest Test

Outros tipos... Code CodeTest Test Se paração de responsa bilidades

Outros tipos... CodeTest

Outros tipos...Test Code

Outros tipos...Test Code Mudança no design

Ainda mais

A idéia

A idéia ?

A idéia? ?

A idéia ? ??

#comofas1. Criticar código2. Analisar a solução ﬁnal3. Planejar os passos4. Mão na massa!

def index(params) scope = Event case params[:timeframe] when tomorrow scope = scope.between_day(DateTime.now + 1) when this_week scope = scope.between_dates(DateTime.now, ( DateTime.now + 6 ).end_of_day) when custom if params[:start_date].blank? params[:start_date] = DateTime.now.beginning_of_week.strftime(%m/%d/%Y) end if params[:end_date].blank? params[:end_date] = (DateTime.now.end_of_week - 2).strftime(%m/%d/%Y) end scope = scope.between_dates(DateTime.strptime(params[:start_date], %m/%d/%Y),DateTime.strptime(params[:end_date], %m/%d/%Y).end_of_day) when hour scope = scope.between_hour_on_day(DateTime.strptime(params[:hour], %m/%d/%Y %H:%M)) when today scope = scope.between_day(DateTime.now) end @events = scope.allend

def index(params) scope = Event switch/case case params[:timeframe] when tomorrow scope = scope.between_day(DateTime.now + 1) when this_week scope = scope.between_dates(DateTime.now, ( DateTime.now + 6 ).end_of_day) when custom if params[:start_date].blank? params[:start_date] = DateTime.now.beginning_of_week.strftime(%m/%d/%Y) end if params[:end_date].blank? params[:end_date] = (DateTime.now.end_of_week - 2).strftime(%m/%d/%Y) end scope = scope.between_dates(DateTime.strptime(params[:start_date], %m/%d/%Y),DateTime.strptime(params[:end_date], %m/%d/%Y).end_of_day) when hour scope = scope.between_hour_on_day(DateTime.strptime(params[:hour], %m/%d/%Y %H:%M)) when today scope = scope.between_day(DateTime.now) end @events = scope.allend

def index(params) scope = Event case params[:timeframe] when tomorrow scope = scope.between_day(DateTime.now + 1) when this_week string parse scope = scope.between_dates(DateTime.now, ( DateTime.now + 6 ).end_of_day) when custom if params[:start_date].blank? params[:start_date] = DateTime.now.beginning_of_week.strftime(%m/%d/%Y) end if params[:end_date].blank? params[:end_date] = (DateTime.now.end_of_week - 2).strftime(%m/%d/%Y) end scope = scope.between_dates(DateTime.strptime(params[:start_date], %m/%d/%Y),DateTime.strptime(params[:end_date], %m/%d/%Y).end_of_day) when hour scope = scope.between_hour_on_day(DateTime.strptime(params[:hour], %m/%d/%Y %H:%M)) when today scope = scope.between_day(DateTime.now) end @events = scope.allend

def index(params) scope = Event case params[:timeframe] when tomorrow scope = scope.between_day(DateTime.now + 1) when this_week scope = scope.between_dates(DateTime.now, ( DateTime.now + 6 ).end_of_day) when custom if params[:start_date].blank? params[:start_date] = DateTime.now.beginning_of_week.strftime(%m/%d/%Y) end if params[:end_date].blank? params[:end_date] = (DateTime.now.end_of_week - 2).strftime(%m/%d/%Y) end scope = scope.between_dates(DateTime.strptime(params[:start_date], %m/%d/%Y),DateTime.strptime(params[:end_date], %m/%d/%Y).end_of_day) when hour scope = scope.between_hour_on_day(DateTime.strptime(params[:hour], %m/%d/%Y %H:%M)) when today scope = scope.between_day(DateTime.now) end escopos diferentes @events = scope.allend

class Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => ["at >= ? AND at <= ?", start_date, end_date ] } } named_scope :between_hour_on_day, lambda { |start_hour| end_date = start_hour + 1.hour-1.second { :conditions => {:at => start_hour..end_date} } } named_scope :between_day, lambda { |date| start_date = date.at_beginning_of_day end_date = start_date.end_of_day { :conditions => {:at => start_date..end_date} } }end

jeitos diferentes de fazer a mesmaclass Event < ActiveRecord::Base coisa named_scope :between_dates, lambda { |start_date, end_date| {:conditions => ["at >= ? AND at <= ?", start_date, end_date ] } } named_scope :between_hour_on_day, lambda { |start_hour| end_date = start_hour + 1.hour-1.second { :conditions => {:at => start_hour..end_date} } } named_scope :between_day, lambda { |date| start_date = date.at_beginning_of_day end_date = start_date.end_of_day { :conditions => {:at => start_date..end_date} } }end

class Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => ["at >= ? AND at <= ?", start_date, end_date ] } } named_scope :between_hour_on_day, lambda { |start_hour| end_date = start_hour + 1.hour-1.second { :conditions => {:at => start_hour..end_date} } } mais lógica named_scope :between_day, lambda { |date| start_date = date.at_beginning_of_day end_date = start_date.end_of_day { :conditions => {:at => start_date..end_date} } }end

Plano1. Centralizar lógica de manipulação de datas2. Uniﬁcar named scopes3. Extrair lógica do Controller4. Quebrar lógica de timeframes diferentes

def index(params) case params[:timeframe] when tomorrow date = DateTime.now + 1 start_date = date.at_beginning_of_day end_date = start_date.end_of_day when this_week start_date = DateTime.now end_date = (DateTime.now + 6 ).end_of_day when custom start_date = params[:start_date].blank? ? DateTime.now.beginning_of_week :DateTime.strptime(params[:start_date], %m/%d/%Y) end_date = params[:end_date].blank? ? (DateTime.now.end_of_week - 2) :DateTime.strptime(params[:end_date], %m/%d/%Y).end_of_day when hour start_date = DateTime.strptime(params[:hour], %m/%d/%Y %H:%M) end_date = start_date + 1.hour-1.second when today date = DateTime.now start_date = date.at_beginning_of_day end_date = start_date.end_of_day end @events = Event.between_dates(start_date, end_date)end

class Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => {:at => start_date..end_date}} }end

class Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => {:at => start_date..end_date}} }end lib/calendar_search_controller.rb | 27 +++++++++++++-------------- lib/event.rb | 13 +------------ spec/event_spec.rb | 37 ------------------------------------- 3 files changed, 14 insertions(+), 63 deletions(-)

Antes . ............ ds 0 .49367 secon Finished in res 13 examp les, 0 failuclass Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => {:at => start_date..end_date}} }end lib/calendar_search_controller.rb | 27 +++++++++++++-------------- lib/event.rb | 13 +------------ spec/event_spec.rb | 37 ------------------------------------- 3 files changed, 14 insertions(+), 63 deletions(-)

Antes Depois ....... . ............ ds Finished in 0 .49367 secon 0.25355 seco Finished in res 7 examples, nds 13 examp les, 0 failu 0 failuresclass Event < ActiveRecord::Base named_scope :between_dates, lambda { |start_date, end_date| {:conditions => {:at => start_date..end_date}} }end lib/calendar_search_controller.rb | 27 +++++++++++++-------------- lib/event.rb | 13 +------------ spec/event_spec.rb | 37 ------------------------------------- 3 files changed, 14 insertions(+), 63 deletions(-)

class CalendarSearchController attr_reader :events def index(params) timeframe = TimeFrame.for(params[:timeframe], params[:start_date],params[:end_date], params[:hour]) @events = Event.between_dates(timeframe.start_date, timeframe.end_date) endend mudança nos testes:it "should create time frame from params and retrieve events" do timeframe = TimeFrame.new(DateTime.now, DateTime.now) TimeFrame.should_receive(:for).with(today, start, end,hour).and_return(timeframe) events = [Event.new, Event.new] Event.should_receive(:between_dates).with(timeframe.start_date,timeframe.end_date).and_return(events) @controller.index(:timeframe => today, :start_date => start, :end_date =>end, :hour => hour) @controller.events.should == eventsend

class TimeFrame < Struct.new(:start_date, :end_date) def self.for(type, start_date, end_date, hour) case type when tomorrow date = DateTime.now + 1 TimeFrame.new(date.at_beginning_of_day, date.end_of_day) when this_week TimeFrame.new(DateTime.now, (DateTime.now + 6 ).end_of_day) when custom start_date = start_date.blank? ? DateTime.now.beginning_of_week :DateTime.strptime(start_date, %m/%d/%Y) end_date = end_date.blank? ? (DateTime.now.end_of_week - 2) :DateTime.strptime(end_date, %m/%d/%Y).end_of_day TimeFrame.new(start_date, end_date) when hour start_date = DateTime.strptime(hour, %m/%d/%Y %H:%M) end_date = start_date + 1.hour-1.second TimeFrame.new(start_date, end_date) when today date = DateTime.now TimeFrame.new(date.at_beginning_of_day, date.end_of_day) end endend

describe TimeFrame do before do @today = DateTime.strptime(06/01/2011, %m/%d/%Y) DateTime.stub!(:now).and_return(@today) end describe "todays event" do it "should use beginning and end of day" do timeframe = TimeFrame.for(today, nil, nil, nil) timeframe.start_date.should == @today.at_beginning_of_day timeframe.end_date.should == @today.end_of_day end end ...end

describe TimeFrame do before do @today = DateTime.strptime(06/01/2011, %m/%d/%Y) DateTime.stub!(:now).and_return(@today) end describe "todays event" do it "should use beginning and end of day" do timeframe = TimeFrame.for(today, nil, nil, nil) timeframe.start_date.should == @today.at_beginning_of_day timeframe.end_date.should == @today.end_of_day end Rakefile | 4 ++ end lib/calendar_search_controller.rb | 24 +--------- ... lib/time_frame.rb | 24 ++++++++++end spec/acceptance_tests.rb | 75 +++++++++++++++++++++++++++++++ spec/calendar_search_controller_spec.rb | 75 ++++--------------------------- spec/time_frame_spec.rb | 63 ++++++++++++++++++++++++++ 6 files changed, 178 insertions(+), 87 deletions(-)

Antes ....... dsdescribe d in 0 .25355 secon Finishe TimeFrame do es before les, 0 failur 7 examp do @today = DateTime.strptime(06/01/2011, %m/%d/%Y) DateTime.stub!(:now).and_return(@today) end describe "todays event" do it "should use beginning and end of day" do timeframe = TimeFrame.for(today, nil, nil, nil) timeframe.start_date.should == @today.at_beginning_of_day timeframe.end_date.should == @today.end_of_day end Rakefile | 4 ++ end lib/calendar_search_controller.rb | 24 +--------- ... lib/time_frame.rb | 24 ++++++++++end spec/acceptance_tests.rb | 75 +++++++++++++++++++++++++++++++ spec/calendar_search_controller_spec.rb | 75 ++++--------------------------- spec/time_frame_spec.rb | 63 ++++++++++++++++++++++++++ 6 files changed, 178 insertions(+), 87 deletions(-)

Antes Depois ........ ....... ds Finished indescribe d in 0 .25355 secon she TimeFrame do 0.17938 seco nds Fini 8 examples, before les, 0 failures 7 ex amp do 0 failures @today = DateTime.strptime(06/01/2011, %m/%d/%Y) DateTime.stub!(:now).and_return(@today) end describe "todays event" do it "should use beginning and end of day" do timeframe = TimeFrame.for(today, nil, nil, nil) timeframe.start_date.should == @today.at_beginning_of_day timeframe.end_date.should == @today.end_of_day end Rakefile | 4 ++ end lib/calendar_search_controller.rb | 24 +--------- ... lib/time_frame.rb | 24 ++++++++++end spec/acceptance_tests.rb | 75 +++++++++++++++++++++++++++++++ spec/calendar_search_controller_spec.rb | 75 ++++--------------------------- spec/time_frame_spec.rb | 63 ++++++++++++++++++++++++++ 6 files changed, 178 insertions(+), 87 deletions(-)

class TimeFrame attr_reader :start_date, :end_date class Today < TimeFrame def initialize date = DateTime.now @start_date, @end_date = date.at_beginning_of_day, date.end_of_day end end ...enddescribe TimeFrame::Today do it "should use beginning and end of day" do timeframe = TimeFrame::Today.new timeframe.start_date.should == @today.at_beginning_of_day timeframe.end_date.should == @today.end_of_day end ...end

class TimeFrame ... def self.for(type, start_date, end_date, hour) case type when tomorrow then Tomorrow.new when this_week then ThisWeek.new when custom then Custom.new(start_date, end_date) when hour then Hour.new(hour) when today then Today.new end endenddescribe TimeFrame::Today do ... describe "parsing" do it "should parse todays timeframe" do TimeFrame.for(today, nil, nil, nil).shouldbe_an_instance_of(TimeFrame::Today) end ... endend

class TimeFrame ... def self.for(type, start_date, end_date, hour) case type when tomorrow then Tomorrow.new when this_week then ThisWeek.new when custom then Custom.new(start_date, end_date) when hour then Hour.new(hour) when today then Today.new end endenddescribe TimeFrame::Today do ... describe "parsing" do lib/time_frame.rb | 59 +++++++++++++++++++++++++++++++++------------- it "should parse todays timeframe" do spec/time_frame_spec.rb | 44 ++++++++++++++++++++++++++-------- TimeFrame.for(today, nil, nil, nil).should 2 files changed, 75 insertions(+), 28 deletions(-)be_an_instance_of(TimeFrame::Today) end ... endend

class TimeFrame ... Antes .def .self.for(type, start_date, end_date, hour) ... ... case type ds 0 .17938 secon when tomorrow then Tomorrow.new Finished in when les, 0 failures ThisWeek.new 8 examp this_week then when custom then Custom.new(start_date, end_date) when hour then Hour.new(hour) when today then Today.new end endenddescribe TimeFrame::Today do ... describe "parsing" do lib/time_frame.rb | 59 +++++++++++++++++++++++++++++++++------------- it "should parse todays timeframe" do spec/time_frame_spec.rb | 44 ++++++++++++++++++++++++++-------- TimeFrame.for(today, nil, nil, nil).should 2 files changed, 75 insertions(+), 28 deletions(-)be_an_instance_of(TimeFrame::Today) end ... endend

class TimeFrame ... Antes Depois ............ def .self.for(type, start_date, end_date, hour) . .... ... case type ds Finished in when d in 0 .17938 secon she tomorrow then Tomorrow.new 0.19023 seco nds Fini 13 examples, when les, 0 failures ThisWeek.new 8 examp this_week then 0 failures when custom then Custom.new(start_date, end_date) when hour then Hour.new(hour) when today then Today.new end endenddescribe TimeFrame::Today do ... describe "parsing" do lib/time_frame.rb | 59 +++++++++++++++++++++++++++++++++------------- it "should parse todays timeframe" do spec/time_frame_spec.rb | 44 ++++++++++++++++++++++++++-------- TimeFrame.for(today, nil, nil, nil).should 2 files changed, 75 insertions(+), 28 deletions(-)be_an_instance_of(TimeFrame::Today) end ... endend

Obrigado!Danilo Sato - @dtsato ThoughtWorks www.dtsato.com

sato/kata-refac toring-calendarhttp: //github.com/dt Obrigado! Danilo Sato - @dtsato ThoughtWorks www.dtsato.com

Refactoring Katas - AgileBrazil 2011

by Danilo Sato on Jun 30, 2011

Accessibility

Categories

Upload Details

Usage Rights

1 Embed 1

Statistics

Refactoring Katas - AgileBrazil 2011 Presentation Transcript